Dust-collector.



Patented Sept. 24, 190|.

No. 683,3l3. r

' .1. E. MITCHELL. .DUSTl COLLECTOR.

l(pplcmcun tilnd Ang. 25, 1900.) (No Model.) 5 Sheets-Sheet L Tan, n. cl

norms mans oo.. Puofoumol, wismna No. 683,3I3. Patented Sept. 24, |901.f J. E. MITCHELL.

DUST COLLECTOR.

, (Application led Aug. 25, 19100;.)y

(No Model.)

5 sheets-sheet 2.

WM l Imi/maior M WJ Y jy @mE/Kitch@ N0. 683,3I3. Patented Sept. 24,|901. J. E. MITCHELL.

` DUST COLLECTOR.

. (Application filed Aug. 25, 1900.)

(No Model.) 5 Sheets--Sheet 3.

No. 683,343. Patented sept. 24, |901. J. E. MITCHELL.

DUST COLLECTOR.

(Application iled Aug, 25, 1900.) (No Model.) 5 Sheets-Sheet 4.

'mz wams PETERS co. wmoumc.. wumcmu, o. c

l No. 683,3l3.

Patented sept. 24, 190|. Jz. E. MITCHELL. I DUST COLLECTOR. (Appf n umI1A g 25 1900) (No Model.)

"UNITED STATES PATENT EEICE.

JOHN E. MITCHELL, OE S'T. LOUIS, MISSOURI, ASSIGNOR To THE IIIITCIIELL'-PARKS MANUFACTURING COMPANY, OE SAME PLACE.

DUST-COLLCTOR.

SPECIFICATION forming part of Letters Patent No. 683,313, datedSeptember 24, 1901.

Application iiled .August 25', 1900. Serial No. 283059. (No model.)

T if/ZZ whom it may concern: rings which fit Within the bearing-rings 2Be it known thatl I, JOHN E. MITCHELL, a and are mounted and supportedtherein. citizen of the United States, residing at St. ,These hubs orrings 7 have secured to them f Y Louis, in the State of Missouri,haveinvented `and extending radially therefrom the seg- '5 5 new anduseful Improvements in Dust-Collmental spokes 9, which are connected toeach lectors, of which the following is a specicaother near their outerends by the rings 10, tion. said rings serving to brace or support saidMy invention relates to dust-collectors, the spokes and hold them spacedapart at reguobject of the same being to provide improved lar intervals.The outer end of each of the 6o Io means for automatically cleaning thecloth spokes 9 is formed with a notch 11, the said or filtering-Wallsand means for preventing notches forming seats for the longitudinallytheescape of fine granular dust that would extending ribs or bars l2, thesaid bars conordinarily pass through the filtering-Walls `necting thespokes 9 at opposite ends of the immediately after they are cleaned.reel. The segmental spokes 9, secured to 65 I5 A further object of theinvention is to proeach other and to the rings 7, constitute the vide animproved construction and means open circular heads of the reel 8.VVithiu for mounting the cloth-frames in the rotary the reel 8 areremovably mounted the cloth Wheel whereby a large area offiltering-suror filtering frames 13, each of said frames face may beobtained in a comparatively being made up ot segmental end pieces 14,70zo small space and whereby the said frames connected together at theirinner or conmay be separately removed and replaced in tracted ends bythe longitudinally-extending the reel. strips 15, and connected togetherat their Other objects and advantages of the in- .outer or Wider ends bythe narrow metallic vention will hereinafter appear, and the or woodenstrips 16. Secured to the outer 75' novel features thereof will be setforth in surfaces of the segmental end pieces 14: are the claims. y therectangular ribs 17, having parallel side In the drawings forming a partof this walls and of the same width as the spaces specification, Figure1 is an end elevation between two adjacent spokes 9 of the reel 8. of adust-collector embodying my improve- The ltering cloth or wall 18 issecured to 8o 3o ments. Fig. 2 is a side elevation of the same. eachframe 13 by folding thesame around Fig. 3 is a cross-section. Fig. 4 isa central `the narrow strips 16, connecting the outer longitudinalsection. Figs. 5 and 6 are deends of the end` pieces 14, and tacking ittail views of one of the cloth-frames em-4 along its side and bottomedges to the edges ployed. Fig` 7 is a detail View of a portion ofthesegmental end pieces 14 and to the 85 ott-he reel.longitudinally-extendingstrip15. Construct-Likereference-numeralsindicate like part-s `ed as described, thecloth-frames are adaptin the different views. ed to be inserted into thereel 8, with the ribs To the main frame 1 of vthe machine are 17 thereontting within the spaces between secured at oppositeends thebearing-rings` the spokes 9 of said reel. The inner ends 9oV 4o 2 forthe rotary reel, which, as shown, are cirof said frames are supportedupon the coilcular in form and are provided with flanges springs 19,projecting from the rings 7, and 3, extending outwardly therefrom.Within outward movement of said frames is preventeach of thebearing-rings 2 is located a staed by the removable stop-pieces 20,which, as tionary head 4, havinga rectangularopening shown, are in theform of screws projecting 95- therein,with which the wind-trunks I5,carrylaterally from the sides of the ribs 17` and ening the dust-ladenair from the fan or blower, gaging the inner edges of the rings 10 ofthecommunicate. The heads 4 are secured in reel. These stop-pieces servenot only to preplace by the brackets (i, which are attached vent theaccidental removalof the cloththereto and to the upright beams of Vtheframes from thereel, but also serve to main- Ico 5o frame 1. A tain` thesprings 19 in a slightly-compressed The hubs 7 of the rotary rcel 8consist of` condition. When it is desired to remove thea frames 13 fromthe reel for the purpose of repair or for any other purpose, all that isnecessary to do is to remove the screws 2O and slip the frames outwardlyin a manner readily understood. It will thus be seen that any one or allof the cloth-frames may be readily removed and replaced and that whenthey are in place within the reel the inner ends thereof or the strips15 form a central drum into which the dust-laden air is discharged bythe wind-trunks 5 at either end of the machine through the stationaryheads 4. It will also be seen that when the cloth-frames are in place anextremely large iiltering-surface is provided within the comparativelysmall space in which said frames are located.

Within the upper part of the central drum formed by the inner ends ofthe cloth-frames When the latter are in place is located a cutoff ordead-airdust-receiving chamber 2l, and in this chamber is mounted arotary conveyer 22, designed for the purpose of carrying off theaccumulation of dust withinsaid chamber. The said cut-off chamberisprovided at its upper end with laterally-extending wings 28, whose upperedges lie in close contact with the inner edges of the strips 15,. andis designed to exclude dust-laden air from two or more cloth-frames orfiltering-walls at the uppermost portion of the reel. As shown in Fig. 3of the drawings, two of the passages leading to the cloth-frames are cutoff from the dust-laden air in the central drum by the wings 23 of thechamber 2l, while four of the passages leading into said cloth-framesare in communication with said cut-off chamber.

Above the rotary reel 8 and secured to the the filtering-walls thereofas said frames are brought in succession opposite the same. Asheretofore stated, two or more filtering-walls or cloth-frames are incommunication with the cut-o chamber 2l at the same time. This permitsthe air from the compressor 24 to be frames and to escape through thecloth on the other or others oneither side thereof and in the meantimeto deposit the dust removed into the cut-off chamber 2l, whence it isdischarged by the conveyer 22. By mechanism which will be describedlater the reel 8, can rying the cloth-frames 13, is given an interi`mittent movement to bring each of said clothframes in successionopposite the nozzle 26 of the compressor 24 and also opposite'th'ecut-off or dead-air chamber 21, containing the conveyer 22.' As eachframe is brought opposite the nozzle 2li the piston 25 lis depressed,which causes apositivev reverse blast by said reverse draft maytherefore escape from the cut-off chamber 21 without permitting the dustcarried thereby to escape. This is an essential feature of constructionof my invention. In addition to providing the reverse blast through thefiltering-walls of the Acloth-frames from the nozzle 26 of thecompressor 24 I also provide means whereby each of the cloth-frames asthey are subjected to the reverse blast referred to may be given aslight jar, which will tend to complete the dislodgment of the dust fromthe walls of said frames and more effectively clean the same. This meansconsists of a pair of hammers 27, attached to the outer ends of levers28, fulcrumed upon the under side of the compressor 24 and located andadapted tomove within the nozzle 26. Near the fulcrum-point of each ofsaid levers is attached a rod or arm 29, which extends upwardly throughthe piston 25 and has a head 8O thereon, which is adapted to be engagedby said piston for the purpose of elevating said levers. Upon theupstroke of the piston 25 the levers 28, carrying the hammers 27, areraised; but upon the downstrok-e thereof, at which time the reverseblast is caused to pass through the cloth-frame then being cleaned, thehammers 27 are allowed to drop and strike against the opposite ends ofthe cloth-frame 13, imparting a' slight jar thereto against the actionof the supporting-springs 19, upon which said cloth-frame is mounted.This jar or agitation of the frame, which is imparted simultaneouslywith the reverse blast of air through the filtering-walls thereof, tendsto completely dislodge the dust from said filtering-walls and dischargethe same into the cut-off chamber 21.

The filtering-wallslS of the cloth-frames 13 will ordinarily collectpractically all of the forced through the cloth 1S on one of said l dustcontained in the air passing through the rsame; but in some cases thenature of the dust is such that it has a tendency to pass 'through thecleaned filtering-walls immediately after passing the cut-oifchamber 2lwhen thev rst gust of dust-laden air strikes them. To prevent the escapeof dustv at this point, I employ a supplemental cut-off chamber 31,mounted in contact with the periphery of the reel 8. A suction iscreated in any suitable way in the supplemental chamber 31, which tendsto carry off any dust which may pass through the cleaned filtering-wallsof the cloth-frames which may be in communication therewith. This dustistherefore prevented from escaping into the atmosphere, and the provisionof this supplemental chamber makes the apparatus practically dustless7as IOO.

there is very little, if any, tendency for the dust to escape at otherpoints in the machine.

The mechanism for operating the various movable parts of my machineconsists of a drive-shaft 32, having a belt-wheel 33 thereon, connectedwith any suitable source of power, and also having a belt wheel orpulley 34 thereon, around which passes the belt 35, the said belttransmitting the motion of the drive-shaft 32 to 4the rotary conveyer22. Secured to the drive-shaft 32, adjacent to the belt wheel or pulley34, is a pinion 36, which meshes with one of a pair of intermeshing spurwheels or gears 37 38. Said gears 37 38 are loose upon the crank-shafts39 40, but are provided on one side with laterally-extending projections4l 4l, adapted to engage the cranks on the shafts 39 and40respectively.. To the cranks on said shafts are pivoted the links 4243, attached at their lower ends to a cross-head 44, adjustably securedto the piston-rods 45 of the piston 25, forming part of theair-compressor 24. During the rotation of the drive-shaft 32 acontinuous rotary movement will be imparted to the conveyer 22 throughthe belt 35. A continuous rotary movement in opposite directions is alsoimparted to the gears 37 and 38. Upon the upward movement of theprojections 4l on said gears the said projections engage with the crankportions of the shafts 39 and 40 and turn said shafts with them. Whensaid crank portions reach their uppermost positions, however, at whichtime the piston 25 is raised, said shafts are permitted to turnindependently of the gears 37 and 38 and continue to turn in the samedirection, but at an accelerated rate of speed, with the result Y thatthe piston 25 drops by gravity, compressing the air beneath the same andforcing itl out through the nozzle 26 and through the filtering-walls ofthe cloth-frame which is in communication with said nozzle. At the sametime the hammers 27 are permitted to strike against the ends of theclothframe beneath the nozzle 26, and a jar is thereby imparted to saidcloth-frame, which serves to assist the reverse blast in removing theaccumulated dust from the inner surfaces of the tilteringwalls. Toprovide for the intermittent rotation of the reel 8, I employ aneccentric-shaft 46, which is suitably geared with the crank-shaft `39and is driven therefrom. To the eccentrics 47 at the opposite ends ofthe shaft 46 are connected the downwardly-extending pawls 48, which areadapted to engage with the ratchet-teeth 49 on the rings 7,. Upon thedownstroke of the pawls 48 the engaging ends thereof ride over' theinclined walls of the ratchet-teeth 49; but upon the upstrokeof saidpawls they are in engagementwith the shouldered portions of the teeth 49and rotate the reel 8 a distance corresponding to the thickness of oneof the cloth-frames mounted in said reel, so as to bring a newcloth-frame to be cleaned opposite the nozzle 26 of the compressor 24.The

connection between the crank-shaft 39 and the eccentric-shaft 46 is byway of reducinggearing, which provides for the rotation of theeccentric-shaft 46 at a slower differential of two to one and permitsthe compressor 24 to deliver two blasts of air and the hammers 27 tooperate twice on each cloth-frame 13 before the reel 8 is rotated andthe next sncceeding cloth-frame is brought into position for cleaning.

I have found that to accomplish the best results in automaticallycleaning the cloth in the dust-collector it is not only necessary to jarthe cloth While the dust-laden air is excluded from its inner surface,but that it is also necessary to force a powerful current of air throughthe opposite side of the cloth simultaneously with the striking of thehammer. It is therefore apparent that the cutoff chamber 2l mustbe wellventilated without permitting the escape of dust. I find it mostpractical to ventilate this chamber back through the cloth again, andfor that purpose enough cloth `is always in communication with thecut-off chamber to allowr twice as much filtering-.surface for the airto pass out as the surface being cleaned. This permits free ventilationof the air and prevents the escape of dust. Other means, however, may

be provided for Ventilating the cut-off chamber2l, and I therefore donot desire to be limited to the exact construction and arrangement ofparts shown.

I am aware that it is not. new to create a reverse current of airthroughthe cloth being cleaned; but this is usually accomplished by means of aback draft applied to the cutoff chamber, which is not very effective byreason of the fact that it is impossible to create suicient draft in thecut-off chamber to assist to any great extent in cleaning the cloth incommunication with said chamber without drawing the dust backinto theinlet of the fan, and this, as is well known, is objectionable. i,

i As a means for giving the eccentric-shaft 46 the slower differentialof two to one compared with the crank-shaft from which it is driven saideccentric-shaft 46 may be driven from the adjacent crank shaft 39 bymeans of sprockets 50 and 5l and chain 52 at the opposite end of themachine from that shown in Fig. l. The sprocket 50 on shaft 46 beingtwice the diameter of the sprocket 5l on the crank-shaft 39 would ofcourse give the eccentric-shaft 46 a speed of one-half that of thecrank-shaft.

Having now described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is

l. In a dust collector, a reel, radially-arranged filtering-wallstherein, separated from each other to form spaces, the adjacent pairs ofsaid walls being closed-` at their inner and outer ends alternately toform inner and outer IOO IIO

spaces, the inner spaces communicating at their inner ends with acentral drum into esame which dust-laden air is introduced, and theouter spaces communicating with the out-- side, a ventilated cut-off ordust-receiving chamber in said drum communicating with and adapted toexclude dust-laden air from a plurality of said inner spaces, a nozzlecoinmunicating with and closing the open outer end of one of the outerspaces over said chamber, means for forcing a reverse current of airthrough said nozzle, and means for jarring the iiltering-Walls betweenwhich said reverse current is introduced.

2. In a dust-collector, a reel, radially-arrangedIiltering-compartinents thereinhaving open outer ends, the inner ends ofsaid compartments forming or communicating.V

with a central drum into which dust-laden air is introduced, aventilated cut-off or dustreceiving chamber in said drum communicatingwith and adapted to exclude dust-laden air from the inner ends of aplurality of said compartments, a nozzle communicating with and closingthe open outer end of one of the compartments in communication with saidchambers, means for forcing a reverse cur- -rent of air through saidnozzle, and means for jarring the compartment receiving the current ofair from said nozzle.

3. In a dust-collector, a reel, radially-arranged iiltering-compartmentstherein having open outer ends, the inner ends of said compartmentsforming or communicating with a centralvdrum into which dust-laden airis introduced, a ventilated cut-off or dustreceiving chamber in saiddrum communicating with and adapted to exclude dust-laden air from theinner ends of a plurality of said compartments, a nozzle communicatingwith and closing the open outer end of one of the compartments incommunication with said chamber, means for forcing a reverse current ofair through said nozzle, and means for simultaneously jarring thecompartment receiving the current of air from said nozzle.

4. Ina dust-collector, a reel, radially-arranged ltering-compartments.therein having open outer ends, the inner ends of said compartmentsforming or communicating with a central drum into which dust-laden airis introduced, a ventilated cut-off or dustreceivng chamber in said drumcommunicating with and adapted to exclude dust-laden air from the innerends of a plurality of said compartments, an aircompressor, a nozzlethereon communicating with the open outer end of one of the compartmentsin communication with said chamber, a piston for forcing a reversecurrent of air through said nozzle, actuating means for said piston, andmeans thrown into operation by said actuating means for jarring thecompartment receiving the current 'of air from said nozzle.

5. In a dust-collector, a cut-off chamber, a plurality oflterin-g-compartments in communication therewith, means for forcing areverse current of air through the filteringwalls of one of saidcompartments and allowing it to escapeV through the walls of theadjacent compartment or compartments, and means thrown into operation bythe reversecurrent-actuating means for simultaneously jarring thefiltering-compartments through which said reverse current passes.

6. In a dust-collector, a ventilated cut-off chamber, a plurality offiltering-compartments in communication therewith, an aircompressor forforcing al reverse current of air through the iiltering-walls of thecompartments in communication with said chamber,

hammers for simultaneously jarring said filtering-compartments, andconnections be, tween said hammers and the piston of said compressorwhereby the former are actuated by the latter.

7. In a dust-collector, a rotary reel, radially-arranged cloth-framesmounted in and carried by said reel, the inner ends of said cloth-framescommunicating with and forming a central drum into which dust-laden air,under pressure, is introduced, a cut-off chamber in said drum incommunication with, and adapted to exclude dust-laden air from, aplurality of said frames, an air-compressor comprising a box or cylinderhaving a nozzle thereon communicating with one of the clothframes whichare in communication with said cut-0E chamber, and a piston bodilymovable in said box designed to force a reverse current of air throughsaid nozzle and through the walls of the cloth-frame in communicationtherewith, actuating means for said piston, means for imparting anintermittent movement to said reel to bring said clothframessuccessively opposite said nozzle and means for jarring said framessimultaneously with the actuation of said piston, as and for the purposeset forth.

8. In a dust-collector, a rotary reel, radially-arranged cloth-framesmounted in and carried by said reel, the inner ends of said clothframesforming a central drum into which dust-laden air, under pressure, isintroduced, a cut-off chamber in said drum in communication with, andadapted to exclude dust laden air from, a plurality of said frames, anair-compressor comprising a box or cylinder having a nozzle thereoncommunicating with one of the cloth-frames which are in communicationwith said cut-off chamber, and a piston designed to force a reversecurrent of air through said nozzle and through the Walls of thecloth-frame'in communication therewith, a plurality of hammerspivotally` mounted in said nozzle and adapted to strike the outer endsof said-clothframes, connections between said hammers and said piston,whereby the former are actuated by the latter, actuating means for saidpist-on, and means for imparting an intermittent movement to said reelfor successively bringing said cloth-frames opposite said nozzle, as

and for the purpose set forth.

9. In a dust-collector, cleaning mechanism for the filtering-surfaces,comprising a venti- IOO IIO

lated cut-off chamber, and means for forcing a reverse current of airthrough the Iilteringsurfaces incommunication therewith, and asupplemental cut-off chamber for preventing the escape of tine particlesof dust from the cleaned filtering-su rfaces, the said supplementalchamber being located at a point opposite that at which the cleanedsurfaces or filtering-Walls receive the first gust of dust? laden airafter passing from said cleaning mechanism.

l0. In a dust-collector,a rotary reel, a series of radially-arrangedcloth-frames mounted in and carried by said reel, the inner ends of saidframes constituting a drum into which dustladen air,under pressure, isintroduced, a cutoif chamber in said drum in communication with, andadapted to exclude dust-laden air from, a plurality of said frames,means for cleaning the ltering-surfaces of the frames in communicationwith said chamber, and'discharging the dust thereinto, and asupplemental cut-oft chamber for preventing the es` cape of fineparticles of dust which pass through the cleaned ltering-Walls of saidframe, the said supplemental chamber lyingin contact with the `peripheryof said reel and located at a point opposite that at which the cleanedcloth-frames receive the first gust of dust-laden air from said drumafter passing from the cut-off chamber.

l1. In a dust-collector, a reel, aseries of radially-arrangedcloth-frames therein bodily movable independently of said reel, springssupporting said frames at their inner ends, and means for jarring saidframes.

l2. In a dust-collector,a rotary reel, a series of radially-arrangedcloth-frames therein, bodily movable independently of said reel,theinner ends of said frames constituting a drum into which dust-laden airunder pressure is introduced, springs supporting said frames at theirinner ends, a cut-o or dead-air chamber in said drum, and means forjarring said frame in opposition to said springs as they aresuccessively brought opposite said charnber.

13. In a dust-collector, a reel comprising a pair of rings constitutingthe hubs thereof,

radially-extending,segmental spokes secured at their inner ends to saidrings and separated one from the other, a ring connecting the spokes oneach of said hubs, and longitudinally-extending rods or bars connectingthe spokes on opposite hubs, a series of clothframes whose end piecesare provided with ribs which iit within the spaces between said spokes,and removable stops on said frames engaging the inner edges of the ringswhich connect said spokes.

14;. In a dust-collector, a reel comprising a pair of rings constitutingthe hubs thereof, radially-extending,segmental spokes secured at theirinner ends to vsaid rings and separated one from the other, a ringconnecting the spokes on each of said hubs, and longitudinally-extendingrods or bars connecting the spokes on opposite hubs, a series ofclothframes Whose end pieces are provided with ribs which t within thespaces between said spokes, springs interposed between the inner ends ofsaid frames and said hubs, removable stops secured to said frames andengaging the inner edges of the rings which connect said spokes,andmeans forjarring said frames in opposition to said springs.

l5. In a dust-collector, a reel whose heads are made up ofradially-extending spokes separated one from the other,and cloth-framesremovably mounted in said reel, each of said frames comprising segmentalend pieces, a longitudinal strip connecting the inner ends of said endpieces, longitudinal strips connecting the outer ends of said endpieces, a sheet of ltering material connecting each of the outerlongitudinal strips, with the inner longitudinal strip and secured tosaid end pieces and to said innerlongitudinal strip,

and lateral ribs on said end pieces ttingV within the spaces between thespokes of said reel, as and for the purpose set forth.

AIn testimony whereof I have hereunto s et my hand in presence of twosubscribing witnesses.

JOHN E. MITCHELL. Witnesses:

AUGUSTINE GALLAGHER, FRANK E. EICHLER.

